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Pierce oscillator oscillates in LTspice but not in AWR

MS20260203412

Hi,

I have a Pierce oscillator that works correctly in LTspice (stable oscillation at the resonant frequency of 1.97 GHz in transient simulation), but when I simulate the same circuit in AWR Microwave Office, it doesn't oscillate. 

BFR92P transistor was used in LTspice, but the exact transistor is not available in AWR. So, I used a built-in AWR BJT transistor and tuned its parameter to match the original device. 

All component values and biasing are the same in both simulators.

Are there specific AWR settings (transient, noise, initial conditions, or anything else) required to start oscillation?

Thank you

  • OscPn
    0

    - AWR oscillators are simulated using elements like OSCAPROBE and OSCNOISE for large-signal oscillator analysis and noise computation.
    - OSCAPROBE initiates the simulation and is modeled as an ideal source in series with an ideal impedance element, presenting an open circuit at frequencies other than the fundamental frequency of oscillation.
    - Key parameters for OSCAPROBE include initial guess at oscillation frequency, frequency range, maximum number of frequency points, and convergence parameters.

    I suggest check the AWR Examples (File > Open Example...) and look for Oscillator examples.

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